Book/Report

FZJ-2016-05066

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Methods for the production of high density, high temperature plasmas by magnetic compression under controlled initial conditions

Jordan, H. L. (Corresponding author)FZJ*

1962
Kernforschungsanlage Jülich Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/12434

Report No.: Juel-0036-PP

Abstract: In earlier magnetic compression experiments, main physical phenomena were observed in the second or later half cycles of the compression field. Plasma conditions at the beginning of the compression were essentially determined by breakdown properties in the previous halfcycle. Uncontrolled value s and distributions of internal magnetic fields, rather high amounts of impurities from wall contamination and inhomogeneity of plasma properties were observed. A general experimental technique has been developed which allows the formation of a plasma with controlled amounts of internal magnetic field, and the subsequent compression of this plasma. The method uses three capacitor banks which can be switched with a high precision consecutively on the same compression coil. As the same compression coil is used in all stages of the experiment, this technique preserves symmetry and can therefore be applied for different field configu rations and coil dimensions, in contrast to other methods for preheating. Measurements on a small scale experiment were made over a large range of parameters and are described in detail in other reports (1, 2, 3,4] at this conference. The essential results are, that in the preheating phase an almost fully ionized, uniform plasma with low impurity content and controlled amount of internal magnetic field is formed. By the subsequent fast compression of this initial plasma, a high density and high temperature plasma is obtained in a fully reproducible way. The ratio $\beta$ of kinetic pressure to external magnetic pressure can be made srnall or close to 1. The pilot experiment has proved the effectiveness of the method. Based on the same principles, a largercompression experiment is now under construction at Jülich.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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